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| 1 | +namespace DevWinUI; |
| 2 | + |
| 3 | +public partial class SnapLayoutManager |
| 4 | +{ |
| 5 | + private const int HTMAXBUTTON = 9; |
| 6 | + |
| 7 | + private Window window; |
| 8 | + private FrameworkElement snapElement; |
| 9 | + private WindowMessageMonitor monitor; |
| 10 | + |
| 11 | + public bool IsEnabled { get; set; } = true; |
| 12 | + |
| 13 | + public void Attach(Window window, FrameworkElement element) |
| 14 | + { |
| 15 | + Detach(); |
| 16 | + |
| 17 | + this.window = window; |
| 18 | + this.snapElement = element; |
| 19 | + |
| 20 | + this.window.Closed += OnWindowClosed; |
| 21 | + |
| 22 | + monitor = new WindowMessageMonitor(this.window); |
| 23 | + monitor.WindowMessageReceived += OnWindowMessageReceived; |
| 24 | + |
| 25 | + window.ExtendsContentIntoTitleBar = true; |
| 26 | + } |
| 27 | + |
| 28 | + private void OnWindowClosed(object sender, WindowEventArgs e) |
| 29 | + { |
| 30 | + Detach(); |
| 31 | + } |
| 32 | + |
| 33 | + public void Detach() |
| 34 | + { |
| 35 | + if (window != null) |
| 36 | + window.Closed -= OnWindowClosed; |
| 37 | + |
| 38 | + if (monitor != null) |
| 39 | + { |
| 40 | + monitor.WindowMessageReceived -= OnWindowMessageReceived; |
| 41 | + (monitor as IDisposable)?.Dispose(); |
| 42 | + } |
| 43 | + |
| 44 | + monitor = null; |
| 45 | + window = null; |
| 46 | + snapElement = null; |
| 47 | + } |
| 48 | + |
| 49 | + private void OnWindowMessageReceived(object? sender, WindowMessageEventArgs e) |
| 50 | + { |
| 51 | + if (!IsEnabled) |
| 52 | + return; |
| 53 | + |
| 54 | + switch (e.MessageType) |
| 55 | + { |
| 56 | + case (uint)NativeValues.WindowMessage.WM_NCHITTEST: |
| 57 | + HandleNcHitTest(e); |
| 58 | + break; |
| 59 | + |
| 60 | + case (uint)NativeValues.WindowMessage.WM_NCRBUTTONDOWN: |
| 61 | + e.Result = 0; |
| 62 | + e.Handled = true; |
| 63 | + break; |
| 64 | + } |
| 65 | + } |
| 66 | + |
| 67 | + private void HandleNcHitTest(WindowMessageEventArgs e) |
| 68 | + { |
| 69 | + if (snapElement == null || window == null) |
| 70 | + return; |
| 71 | + |
| 72 | + int x = (short)(e.Message.LParam.ToInt32() & 0xFFFF); |
| 73 | + int y = (short)(e.Message.LParam.ToInt32() >> 16); |
| 74 | + |
| 75 | + var mouse = new Point(x, y); |
| 76 | + |
| 77 | + Rect rect = GetButtonScreenRect(snapElement); |
| 78 | + if (rect == Rect.Empty) |
| 79 | + return; |
| 80 | + |
| 81 | + if (rect.Contains(mouse)) |
| 82 | + { |
| 83 | + e.Result = (nint)HTMAXBUTTON; |
| 84 | + e.Handled = true; |
| 85 | + } |
| 86 | + } |
| 87 | + |
| 88 | + private Rect GetButtonScreenRect(FrameworkElement element) |
| 89 | + { |
| 90 | + if (element == null || window?.Content == null) |
| 91 | + return Rect.Empty; |
| 92 | + |
| 93 | + var point = element.TransformToVisual(window.Content as UIElement) |
| 94 | + .TransformPoint(new Windows.Foundation.Point(0, 0)); |
| 95 | + |
| 96 | + double scale = element.XamlRoot.RasterizationScale; |
| 97 | + double left = point.X * scale; |
| 98 | + double top = point.Y * scale; |
| 99 | + double width = element.ActualWidth * scale; |
| 100 | + double height = element.ActualHeight * scale; |
| 101 | + |
| 102 | + var hwnd = WinRT.Interop.WindowNative.GetWindowHandle(window); |
| 103 | + var pt = new System.Drawing.Point((int)Math.Round(left), (int)Math.Round(top)); |
| 104 | + Windows.Win32.PInvoke.ClientToScreen(new(hwnd), ref pt); |
| 105 | + |
| 106 | + return new Rect(pt.X, pt.Y, width, height); |
| 107 | + } |
| 108 | +} |
| 109 | + |
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